public static void UpdateText(this UITextView textView, InputView inputView)
{
// Setting the text causes the cursor to be reset to the end of the UITextView.
// So, let's set back the cursor to the last known position and calculate a new
// position if needed when the text was modified by a Converter.
var oldText = textView.Text ?? string.Empty;
var newText = TextTransformUtilites.GetTransformedText(
inputView?.Text,
textView.SecureTextEntry ? TextTransform.Default : inputView.TextTransform
);
// Re-calculate the cursor offset position if the text was modified by a Converter.
// but if the text is being set by code, let's just move the cursor to the end.
var cursorOffset = newText.Length - oldText.Length;
var cursorPosition = textView.IsFirstResponder ? textView.GetCursorPosition(cursorOffset) : newText.Length;
if (oldText != newText)
{
textView.Text = newText;
}
textView.SetTextRange(cursorPosition, 0);
}